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RE: NGC 2770
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ATel 7515: Keck spectroscopy of transient in NGC 2770



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ATel #7514: Possible explosion of the SN impostor in NGC 2770



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UGC 4806
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NGC 2770 (also UGC 4806, MCG 6-20-38, GWT 180.47, KUG 0906 +333 B, IRAS09065 3319, PGC 25806) is a magnitude +12.0 spiral galaxy located 88 million light years away in the constellation Lynx.

The galaxy was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) reflecting telescope at Clayhall Farm House in Old Windsor on the 7th December 1785.

The galaxy hosted three recent supernovae; SN 1999eh , SN 2007uy and SN 2008D.

Right Ascension 09h 09m 33.5s, Declination +33° 07' 27"

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Title: NGC 2770 - a supernova Ib factory?
Authors: Christina C. Thoene, Michal J. Michalowski, Giorgos Leloudas, Nick L. J. Cox, Johan P. U. Fynbo, Jesper Sollerman, Jens Hjorth, Paul M. Vreeswijk

NGC 2770 has been the host of three supernovae of Type Ib during the last 10 years, SN 1999eh, SN 2007uy and SN 2008D. SN 2008D attracted special attention due to the serendipitous discovery of an associated X-ray transient. In this paper, we study the properties of NGC 2770 and specifically the three SN sites to investigate whether this galaxy is in any way peculiar to cause a high frequency of SNe Ib. We model the global SED of the galaxy from broadband data and derive a star-formation and SN rate comparable to the values of the Milky Way. We further study the galaxy using longslit spectroscopy covering the major axis and the three SN sites. From the spectroscopic study we find subsolar metallicities for the SN sites, a high extinction and a moderate star-formation rate. In a high resolution spectrum, we also detect diffuse interstellar bands in the line-of-sight towards SN 2008. A comparison of NGC 2770 to the global properties of a galaxy sample with high SN occurrence (at least 3 SN in the last 100 years) suggests that NGC 2770 is not particularly destined to produce such an enhancement of observed SNe observed. Its properties are also very different from gamma-ray burst host galaxies. Statistical considerations on SN Ib detection rates give a probability of ~1.5% to find a galaxy with three Ib SNe detected in 10 years. The high number of rare Ib SNe in this galaxy is therefore likely to be a coincidence rather than special properties of the galaxy itself. NGC 2770 has a small irregular companion, NGC 2770B, which is highly starforming, has a very low mass and one of the lowest metallicities detected in the nearby universe as derived from longslit spectroscopy. In the most metal poor part, we even detect Wolf-Rayet features, against the current models of WR stars which require high metallicities.

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It is the most violent event in astronomy -- the death of a star -- and it happens in individual galaxies on average about once a century. Earlier this year, Princeton's Alicia Soderberg hit the celestial jackpot when she not only accidentally discovered a second supernova in one galaxy, but observed the moment of its death, something never before witnessed.
The supernova, named SN 2008d, was closer to Earth than any other supernova ever observed. It was located 88 million light-years away, in the constellation Lynx, inside spiral galaxy NGC 2770.

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Supernova 2008D.kmz
Google Sky file (1kb, kmz)


Position(2000): RA 09 09 30.65, Dec +33 08 20.3

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The edge-on spiral galaxy NGC 2770 has produced three bright supernovae recently.
All three supernovae are thought to be of the core-collapse variety, but the most recent of the trio, SN2008D, was first detected by the Swift satellite at more extreme energies as an X-ray flash (XRF) or possibly a low-energy version of a gamma-ray burst on January 9th.
The galaxy is located a 90 million light-years away in the  constellation Lynx.  NGC 2770 is closest galaxy known to host such a powerful supernova event.

 NGC 2770.kmz (2kb, kmz)

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